Fullmetal Alchemist, Vol. 3 — Hiromu Arakawa

In an alchemical ritual gone wrong, Edward Elric lost his arm and his leg, and his brother Alphonse became nothing but a soul in a suit of armor. Equipped with mechanical "auto-mail" limbs, Edward becomes a state alchemist, seeking the one thing that can restore his brother and himself...the legendary Philosopher's Stone.
Accompanied by their bodyguard, Alex Louis Armstrong, our heroes seek out the closest childhood friend, mechanic Winry Rockbell, to fix their battered "auto-mail" body parts. Soon their quest for the Philosopher's Stone takes them to the great central library, where the Stone's formula may be hidden...if the mysterious figure named Lust doesn't get there first! But the secret of the Philosopher's Stone may be even more frightening than the beings who guard it...